Electrostatic Charge Image Developing Carrier Coating
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Solution Overview
Problem
Electrostatic charge image developing carriers face issues with maintaining stable charging performance over time due to changes in surface composition and structure, leading to image defects like white spots, especially under varying temperature and humidity conditions.
Innovation Solution
An electrostatic charge image developing carrier with a coating layer comprising a binder resin, thermosetting resin particles, and crosslinked resin particles, where the crosslinked resin particles are formed by polymerizing the same monomer as the binder resin, to enhance adhesion and prevent separation, thereby controlling wear and maintaining surface stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating layer is formed on the magnetic core particle surface, then charging performance is improved, but the coating layer undergoes wear and separation over time leading to unstable charging performance
Solution Approach 1:
The coating layer is constructed as a composite material system comprising binder resin, thermosetting resin particles, and crosslinked resin particles. This multi-component composite structure combines the advantages of each material: the binder resin provides adhesion, the thermosetting resin particles provide structural integrity and wear resistance, and the crosslinked resin particles provide chemical stability. The synergistic combination prevents coating layer separation and maintains stable charging performance throughout the carrier's service life.
Solution Approach 2:
The patent utilizes thermal and chemical parameter changes during the coating formation process. The thermosetting resin particles undergo thermal curing at elevated temperatures to form a crosslinked network structure, while the crosslinked resin particles provide additional chemical crosslinking. These parameter changes transform the coating layer from a soft, easily-worn state to a hardened, wear-resistant state that maintains its properties over time.
2Strength
If the coating layer is made harder to resist wear, then wear resistance is improved, but adhesion to the magnetic core particle deteriorates
Solution Approach 1:
The coating layer exhibits local quality differentiation through its multi-component structure. The binder resin component provides strong adhesive properties at the interface with the magnetic core particle, ensuring good bonding. The thermosetting resin particles and crosslinked resin particles provide hard, wear-resistant properties in the bulk coating layer. This spatial and functional differentiation allows the coating to simultaneously achieve strong adhesion and high wear resistance.
Solution Approach 2:
The composite coating layer combines materials with complementary properties: the binder resin contributes adhesion, while the thermosetting and crosslinked resin particles contribute hardness and wear resistance. The interfacial regions between these components create a gradient structure that transitions from adhesive to protective functions, resolving the contradiction between adhesion and wear resistance.
3Ease of manufacture
If the coating layer composition is simplified, then manufacturing is easier, but surface stability under varying temperature and humidity conditions deteriorates
Solution Approach 1:
The coating layer utilizes thermal parameter changes during manufacturing to achieve crosslinking and stabilization. The thermosetting resin particles are cured at elevated temperatures to form a stable, crosslinked network structure that resists composition changes under varying service conditions. This thermal processing step, while adding a manufacturing step, creates a coating that is highly stable against temperature and humidity variations during use.
Solution Approach 2:
The composite structure with multiple resin components provides inherent stability against environmental variations. The crosslinked resin particles specifically contribute chemical stability and resistance to hydrolysis, while the thermosetting resin provides thermal stability. This material composition strategy maintains surface stability without significantly complicating the manufacturing process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents changes in surface composition and structure, ensuring stable toner charge over time and reducing image defects such as white spots, even under high temperature and humidity conditions.
Implementation Method 1
the crosslinked resin particle contains a polymer formed by polymerizing a monomer component including the same monomer as a monomer used in the polymerization of the binder resin
Implementation Method 2
the coating layer includes a binder resin, thermosetting resin particles, and crosslinked resin particles
Data Source
AI summary
An electrostatic charge image developing carrier includes a magnetic core particle, and a coating layer that coats surfaces of the magnetic core particle, wherein the coating layer includes a binder resin, thermosetting resin particles, and crosslinked resin particles, and the crosslinked resin particle contains a polymer formed by polymerizing a monomer component including the same monomer as a monomer used in the polymerization of the binder resin.